1. I dress well.
2. I am a good dresser.
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Q1: Are both the same in meaning?
Q2: Can a boy say #1?
Q3: Do we have other expressions similar to #1?
They are both the same in meaning, but #2 is not grammatically correct.
Other expressions ...
I'm a sharp dresser.
I'm dressed to the nines!
I always look well put together.
=)